Market Research: Penthouses

This apartment tops one of the buildings designed by Rosario Candela, the master of Park Avenue bourgeois architecture. The herringbone floors are original; the upstairs bathroom has a brass-and-mirror ceiling; the floor plan is nearly unchanged from Candela’s, its small kitchen separated from the expansive dining room by a door (to keep the staff out of sight). On the terrace off the dining room is what’s called a tea room—the little pavilion seen here. Because 778 is a little taller than many prewars on Park Avenue, tea-sippers can see Central Park from end to end.